Lines of evidence: The science of evolutionThe theory of evolution is broadly accepted by scientists — and for good reason! Learn about the diverse and numerous lines of evidence that support the theory of evolution.

Who's on First? Relative DatingStudents sequence familiar items and then do a similar sequencing activity using fossil pictures to learn how paleontologists use fossils to give relative dates to rock strata.

Understanding Geologic TimeA web-based module in which students gain a basic understanding of geologic time, the evidence for events in Earth's history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.